<template>
  <div id="app">
    <el-menu
      :default-active="activeIndex"
      mode="horizontal"
      background-color="#545c64"
      text-color="#fff"
      :router="asRouter"
      active-text-color="#ffd04b">
      <el-menu-item index="/cardAdd">新增卡片</el-menu-item>
      <el-menu-item index="/cardList">卡片列表</el-menu-item>
      <el-menu-item index="/cardLike">喜欢</el-menu-item>
    </el-menu>
    <router-view/>
  </div>
</template>

<script>
  export default {
    name: 'App',
    data() {
      return {
        activeIndex: '1',
        asRouter: true
      }
    },
    // 页面挂载的时候 添加一个浏览器刷新的监听时间 刷新时调用saveState
    mounted() {
      window.addEventListener('unload', this.saveState);
    },
    methods: {
      saveState() {
        // 把$store中的保存保存到浏览器的sessionStorage里
        sessionStorage.setItem('state', JSON.stringify(this.$store.state));
      }
    }
  }
</script>

<style>
</style>
